A methodology for fast multi-objective antenna optimization is presented. Our approach based on response surface approximation (RSA) modeling and variable-fidelity electromagnetic (EM) simulations. In the design process, a computationally cheap RSA surrogate model constructed from sampled coarse-discretization EM simulations optimized using evolutionary algorithm. The initially determined Pareto optimal set representing best possible trade-offs between conflicting objectives then iteratively...

In this letter, a structure of small ultra-wideband (UWB) monopole antenna, its design optimization procedure as well experimental validation are presented. According to our approach, antenna compactness is achieved by means meander line for current path enlargement the two parameterized slits providing additional degrees freedom that help ensure good impedance matching. For sake reliability, process (simultaneous adjustment multiple geometry parameters) carried out using high-fidelity EM...

A structure of a compact ultra-wideband monopole antenna has been presented. The consists microstrip-fed rectangle radiator as well ground plane with slit and an L-shaped stub. critical factor in achieving small size is careful design procedure involving numerical optimisation all geometry parameters the aiming at explicit reduction while maintaining acceptable electrical performance. final exhibits dimensions only 9.45 × 18.5 mm footprint 175 mm2. Experimental validation comparisons...

In this letter, a simple yet robust and computationally efficient optimization technique for explicit size reduction of antenna structures is presented. Our approach directly handles the as main design objective, while ensuring satisfactory electrical performance by means suitably defined penalty functions. For sake accuracy, structure evaluated using high-fidelity EM simulation. order to maintain computational efficiency process, it carried out cheap adjoint sensitivities trust region...

A technique for low-cost multiobjective optimization of antennas in highly dimensional parameter spaces is presented. The procedure expedited by exploiting fast surrogate models, including coarse-discretization electromagnetic (EM) antenna simulations and response surface approximations (RSA). latter utilized to yield an initial set Pareto nondominated designs that are further refined using correction methods. Efficient handling multiple geometry parameters realized the reduction solution...

Purpose This paper aims to investigate the strategy for low-cost yield optimization of miniaturized microstrip couplers using variable-fidelity electromagnetic (EM) simulations. Design/methodology/approach Usefulness data-driven models constructed from structure frequency responses formulated in form suitably defined characteristic points statistical analysis is investigated. Reformulation characteristics leads a less nonlinear functional landscape and reduces number training samples...

In this letter, a structure of miniaturized ultrawideband (UWB) coplanar waveguide (CPW)-fed antenna and its design procedure are presented. The is modified version the previously proposed in literature, with additional degrees freedom introduced order to improve flexibility. small size achieved by executing rigorous optimization that consists two stages: 1) smart random search carried out at level coarse-mesh electromagnetic (EM) simulation model aims finding an initial featuring reasonable...

In this letter, a computationally feasible technique for dimension scaling of antenna structures is introduced. The proposed methodology based on inverse surrogate modeling where the geometry parameters structure interest are explicitly related to operating frequency. model identified few designs optimized selected reference frequencies. For sake computational efficiency, obtained at level coarse-discretization electromagnetic (EM) simulation model. An appropriate correction allows us...

In this paper, the problem of geometry scaling compact microwave structures is investigated. As opposed to conventional [i.e., constructed using uniform transmission lines (TLs)], re-design miniaturized circuits (e.g., implemented with artificial TLs) for different operating frequencies far from being straightforward due considerable cross-couplings between circuit components. Here, we develop a simple and computationally efficient methodology dimension circuits. The proposed approach...

Non-anechoic sites represent a cheap alternative to measurements of antennas in dedicated facilities. However, due high noise—from the external EM signal sources and multipath interferences—the quality radiation patterns obtained non-anechoic conditions is poor. The characteristics can be corrected using time-gating method (TGM), which involves filtering noise based on temporal analysis measured signals. Unfortunately, determination appropriate TGM setup prone failure its manual, or...

A design of an ultrawideband (UWB) antenna with integrated balun is presented. fully planar configuration interfacing the microstrip input structure to coplanar stripline (CPS) dipole introduced. The electromagnetic (EM) model interest includes dipole, balun, and account for coupling radiation effects over UWB band. EM then adjusted low reflection band by means fast simulation-driven surrogate-based optimization. This approach allows us obtain final at computational costs a high-fidelity...

A methodology for rapid multi-objective design of compact microwave circuits is proposed. Our approach exploits point-by-point Pareto set identification using surrogate-based optimization techniques, auxiliary equivalent circuit models, and space mapping as the major model correction method. The proposed technique illustrated validated through a rat-race coupler. ten designs being trade-offs between electrical performance structure its size (layout area) obtained at cost corresponding to...

In this paper, a methodology for fast multiobjective optimization of the miniaturized microwave passives has been presented. Our approach is applicable to circuits that can be decomposed into individual cells [e.g., compact microstrip resonant (CMRCs)]. The structures are individually modeled using their corresponding equivalent and aligned with accurate, EM simulated representations, by means implicit space mapping (ISM). ISM-corrected then assembled entire Pareto-optimal solutions (here,...

In this work, a step-by-step development of compact microstrip rat-race coupler (RRC) has been presented and discussed. A high degree miniaturization obtained by substituting six quarter-wavelength uniform atomic building blocks RRC their nonuniform counterparts. The procedure realized in three progressive steps: (i) the first layout solution miniaturized acquired using an accurate mathematical model transmission line (NUTL); (ii) second manual refinement electro-magnetic (EM) fine-tuning...

A methodology for rapid design of RF circuits constituted by compact microstrip resonant-cells (CMRCs) is presented. Our approach exploits nested space mapping (NSM) technology, where the inner SM layer used to correct equivalent circuit model at CMRC level, whereas outer enhances coarse entire structure under design. We demonstrate that NSM dramatically improves performance surrogate-based optimization composite CMRC-based structures. It validated using four examples UWB matching...

A computationally efficient technique for multiobjective design optimization of narrowband antennas is presented. In our approach, the corrected low-fidelity antenna model [obtained through coarse-discretization electromagnetic (EM) simulations] enhanced using frequency scaling and response correction, sampled, utilized to obtain a fast surface approximation (RSA) surrogate. The RSA constructed in reduced space. initial set Pareto-optimal designs then confine space further by identifying...

In this paper, a novel methodology for cost-efficient microwave design optimization in the frequency domain is proposed. Our technique, referred to as adaptive response scaling (ARS), has been developed constructing fast replacement model (surrogate) of high-fidelity electromagnetic-simulated structure under using its equivalent circuit (low-fidelity model). The basic principle ARS nonlinear and amplitude aimed at accommodating discrepancies between low- models reference and, subsequently,...

A robust simulation-driven design methodology of microwave circuits with complex topologies has been presented. The general method elaborated is suitable for a wide class N-port unconventional constructed as deviation from classic solutions. key idea the approach proposed lies in an iterative redesign conventional circuit by sequential modification and optimisation its atomic building blocks. speed accuracy presented acquired solving number simple problems through surrogate-based (SBO)...

Design of contemporary antenna structures heavily relies on full-wave electromagnetic simulation models. Such models are essential to ensure reliability evaluating characteristics, yet they computationally expensive and, therefore, unsuitable for handling tasks that require multiple analyses, e.g., parametric optimization. The cost issue can be alleviated by using fast surrogate Conventional data-driven modeling characteristics if the number geometry parameters exceeds a few. Here, novel...

A simple yet robust methodology for rapid multiobjective design optimization of antenna structures has been presented. The key component our approach is sequential domain patching the space, which a stencil-based search that aims at creating path connects extreme Pareto-optimal designs, obtained by means single-objective runs. process yields initial approximation Pareto set representing best possible tradeoffs between conflicting objectives. It realized-for sake computational efficiency-at...

In this study, a concept and design optimisation procedure of novel compact multiple‐input–multiple‐output (MIMO) slot antenna is presented. As the authors’ primary objective to achieve better utilisation available space, individual ultra‐wideband (UWB) antennas are constrained triangular shape optimised for reduced size. Subsequently, MIMO structure assembled using previously designed radiators in orthogonal arrangement. Low computational cost geometry parameter adjustment maintained by...

Purpose Development of techniques for expedited design optimization complex and numerically expensive electromagnetic (EM) simulation models antenna structures validated both experimentally. The paper aims to discuss these issues. Design/methodology/approach task is performed using a technique that combines gradient search with adjoint sensitivities, trust region framework, as well EM various levels fidelity (coarse, medium fine). Adaptive procedure switching between the increasing accuracy...